Testing for early pregnancy with early pregnancy test strips usually requires that the test be done in the morning with morning urine, rather than at night. This is because urine HCG levels rise later than blood HCG, and because urine HCG levels are lower during early pregnancy, urine HCG levels are relatively higher when using morning urine. In the evening, when HCG levels drop due to dilution of urine, false negatives may occur and lead to inaccurate results. It is best to use urine test strips one week after the menstrual period has been delayed, as the results are relatively accurate. Even if the urine test is positive, a blood HCG test should be done. This is because the blood HCG test is a quantitative test, which is more objective and accurate than the urine HCG qualitative test. Whether blood HCG or urine HCG, pelvic ultrasonography should be done at 5-6 weeks after menopause to clarify the location of the embryo and its development.